How do I draw verticle text on image using GDI+?

Graphics class does not have any method to directly draw vertical text on image, however you can draw regular text on image and rotate that image to display vertical text.

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<%@ WebHandler Language="C#" Class="VerticalText"%>

using System;
using System.Web;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Text;

public class  VerticalText : IHttpHandler {
    
    public void ProcessRequest (HttpContext context) {
        context.Response.ContentType ="image/gif";

        Bitmap bitmap = new Bitmap(100, 300);
        Graphics g = Graphics.FromImage(bitmap);
        g.TextRenderingHint = TextRenderingHint.AntiAlias;
        g.Clear(Color.White);
        g.DrawRectangle(Pens.Black, 0, 0
            , bitmap.Width -1, bitmap.Height-1);
        DrawStringVertical(g, new RectangleF(10,10,80,280)
            , "Vertical Text", new Font(FontFamily.GenericSerif,20),
            Brushes.Black);

        bitmap.Save(context.Response.OutputStream, ImageFormat.Gif);
        
    }
 
    public bool IsReusable {
        get {
            return false;
        }
    }

    public static void DrawStringVertical(Graphics g
        , RectangleF r, string Text, Font f, Brush b) {
        
        // Set string format and alignment.
        StringFormat sf = new System.Drawing.StringFormat();
        sf.Alignment = StringAlignment.Center;
        sf.LineAlignment = StringAlignment.Center;
        
        // create temp image
        Bitmap tempImage = new Bitmap((int)r.Height, (int)r.Width);
        
        // now draw text on image.
        Graphics tempGraphics = Graphics.FromImage(tempImage);
        tempGraphics.TextRenderingHint = g.TextRenderingHint;
        tempGraphics.DrawString(Text, f, b
            , new RectangleF(0, 0, tempImage.Width,tempImage.Height), sf);
        tempImage.RotateFlip(RotateFlipType.Rotate270FlipNone);

        // now draw temp image on original image
        g.DrawImage(tempImage, r.X, r.Y);
        tempGraphics.Dispose();
        tempImage.Dispose();
    }
}

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